Please note the balance of the letter "K" on the edge of the left hand perforation (actually it belongs to the stamp immediately to the left on the pane of 100 stamps that were pre-cancelled with the NY overprint).
I have bought many "pre-cancels" like this one in volume for 2-3 cents each. The underlying stamp (without the cancellation) can be bought in volume at 3 for a penny. E-bay lists many multiple offerings.
If you have not already done so, go to www.precancel.com
for more information.
A while back I came across a few of these in my general stamp collection. Upon investigation, I discovered a whole new subset of stamp collecting. Pre-cancels can be very exciting (well, within reason....Ha, Ha!).